@Vane1717 Did you by any chance get a notice saying the guest wants to cancel, asking for you to accept or decline the cancellation? If you did that is registered as a host cancellation. You should always decline those, even if you are amenable to the cancellation. The guest can go ahead and cancel on their own.
If you didn't get a notice like that, it sounds like it was a tech glitch. In any case, I'm glad tohear you got a helpful rep who reversed it.